I think the article got it wrong with the "painless" part. I am also confused with the claim that it is non-surgical. It does seem similar to a regular root can

I think the article got it wrong with the "painless" part. I am also confused with the claim that it is non-surgical. It does seem similar to a regular root canal, but the issue that many people have with root canals is that they drill out infected nerve tissues and fill it with something inert. They do not let the nerve pulp heal and some say the tooth is now "dead". The bacterial infection is cleaned out, but there are often fears that the infection has not been fully dealt with. I believe the point of this technique is allowing the internals of the tooth to heal, which root canals do not do.